Resolve "Possible confusion when using single-value-mode parameter-lists in CLI"

Summary

• Add a method GetListViewSingleSelectionMode to the Application class, and use it from the doc generator to change the "Type" documentation of ListView to "String" or "String List" depending on that flag.
• Improve the PolygonClassStatistics example a bit (not sure what the best example would be)

Rationale

Closes #1686 (closed)

Copyright

The copyright owner is CNES and has signed the ORFEO ToolBox Contributor License Agreement.

---

Check before merging:

• All discussions are resolved
• At least 2 👍 votes from core developers, no 👎 vote.
• The feature branch is (reasonably) up-to-date with the base branch
• Dashboard is green
• Copyright owner has signed the ORFEO ToolBox Contributor License Agreement

added 85 commits

• 9aa93534...fa93eaec - 83 commits from branch develop
• e2cacab9 - Merge branch 'develop' into 1686-clarify-list-param
• ad770812 - ENH: string const ref and no unreachable return (code review)

Compare with previous version

resolved all discussions

added 1 commit

• 4ae70fc2 - BUG: const ref in otbApplication.i

Compare with previous version

resolved all discussions

Status ?

Status is: I am unable to test this fully because I can't build the Cookbook. We also need votes.

resolved all discussions

added 1 commit

• 921bcda4 - BUG: missing argument to GetListViewSingleSelectionMode

Compare with previous version

I managed to build the cookbook locally, fix a small bug, and very that the documentation patch is now working. Needs votes and then ready to merge!

unmarked as a Work In Progress

added to dahboard

changed the description

assigned to @poughov

merged

mentioned in commit b3cb60bd

added documentation label

changed milestone to %7.0.0